And james jamieson



(No Model.)

W. J. KEEP & J. JAMIESON. MEANS FOR FORMING HINGE PIN AND OTHER HOLES.

1111366113. Patented July 5, 188 7.

Fly-f min 2% 1m mm wj N, PETERS, PhulM-ilhognphur, Wuhingtnm D, C.

UNIT D STATES PATENT OFFICE,

"WILLIAM J. KEEP, OF DETROIT, MICHIGAN, AND JAMES J AMIESON, OFHAMILTON, ONTARIO, CANADA.

MEANS FOR FORMING HINGE-PIN AND OTHER HOLES.

SPECIFICATION forming part of Letters Patent No. 366,113, dated July 5,1887.

Application filed April 28, 1886. Serial No. 200,426. (No model) worthand Province of Ontario, Canada, have invented new and usefulImprovements in Means for Forming Hinge-Pin and other Holes; and we dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,which form a part of this specification.

Our invention relates to a new andimproved means for forming the holesin hingeknuckles and other places by the process of casting; and theobject of our invention is to save the labor and expense of drillingholes--such as pin-holes in cast-metal hinge'knuckles, especially theknuckles cast upon stove-doors and stove-door frames, for hanging theparts together by means of a loose pin inserted into the pin-holes oftwo coacting knuckles, as is the usual manner to form such hinges onstoves.

In the manufacture of stoves it is veryimportant to form the hinges veryaccurately, as stovedoors are required to make what is called gas-tightjoints, and, moreover, all the like parts have to be interchangeable.

Previous to our invention it had been pro-- posed to use a slotted chilland pin for the pur pose of making such pinholes; but this wasobjectionable,for the following reasons,among others: The chill left theknuckle or lug in1- perfect, as it chilled the iron to a considerableextent, and, moreover, with this plan the pin and chill each required aseparate handling by the molder, and were liable to get out of place inramming the sand. Chills are also very difficult to make smooth inside,so that they will come off easily, and are therefore difficult to getoff from the hot castings, and are often lost and mixed with the sand.Moreover, owing to the shifting of the pin or chill in the sand, theholes were often slightly out of place, and as the metal became chilledit was impossible to file them, even if that were commerciallypracticable. This is very 0bjectionable, as the least variation in theposition of the hole renders the casting a total loss. Attempts havebeen made to overcome these difficulties by the use of a sheetmetalhood, and a thin tube, to be held in place by the hood. This, however,was found to be objectionable also, inasmuch as theincoming metal wasapt to wash the light tube out of position, and, moreover, when themolten iron surrounded the tube it made the metal of thelatter so softthat it would be pressed inward,

and, irrespective of this, when the metal cooled the shrinkage wouldmake the holein. the tube smaller, and the size and shape of the holewould thus vary. If the shrinkages were regular, this might have made nodifference; but it was found impossible to depend on any amount ofregularity in the shrinking, as, owing to the varying thickness of themetal of the tube, the shrinking varied considerably. This irregularityin the size of the hole is a very serious matter, because the pin mustbe driven in such a manner that it will not fall out, and yet if theholeis one four thousandths of an inch too small the driving in of thepin will split the lug and render the casting useless. Anotherdifficulty was that the tube required filling,which is an extra expenseand trouble. To overcome these various difliculties, we found, afterconsiderable experimenting with the above mentioned plans and much lossresulting therefrom, that if we used a thin sheet hood havingperforations sufficiently small to receive and tightly hold a metal pinthat projected through the sides of the hood, the difficulties connectedwith the plans above referred to were overcome. As the pin was held fastby being tightly fitted into the hood, the two parts required but onehandling by the molder, and, as the metal of the hood is very thin, itdid not chill the metal as it ran in, but, on the contrary, the innersurface of the hood fused and united with the incoming metal. Asthe pinprojected through the hood and was thus firmly held, it was not likelyto get out of place by the ramming in of the sand, and, as the end ofthe pin was firmly held in place by the sand, it also held the hood inplace, and thus both hood and pin were prevented from incoming metal.

It must be remembered that it is necessary IOO . place.

- especially necessary when the hood and pin or tube are in the upper orcope side of the mold, as they are likely to fall by their own weight ifnot securely held by the pin projecting into the sand, as inourimprovement.

In view of the state of the art, as above set forth, we consider ourinvention to consist of a thin metallic hood having, perforations tosecurely hold a pin projecting through the sides of said hood, incontradi'stinction to a slotted chill and pin or toa thin metal hood andtube.

Referring now to the drawings, Figure 1 represents in perspective asection of stoveplate pattern with a hinge-knuckle arranged to carry outour invention. Fig. 2 is a perspective view of the hood. Fig. 3 is aperspective of the hood with the pin in place. Fig. 4 is a sectionalelevation of the hingeknuckle pattern in Fig. 1 as prepared for molding.Fig. 5 is a section of a mold prepared for casting the hinge-knuckle inaccordance with our invention. Fig. 6 is a perspective View of a casthinge-knuckle ready for use. Fig. 7 is a perspective view of the catchof a stove-door and a hood to be used in connection therewith. Fig. Sisa similar view of a lug and a blank from which its hood is formed.

A represents a portion of a stove-plate pattern provided with thehinge-knuckle pattern B, to be used in casting aknuckle with aroundpin-hole. To this end the pattern is cut away so as to form a recess, a,which has tapering sides and arounding bottom, 6, as shown. Into thisrecess is placed before molding a round pin, 0, of sufficient length toproject with one or both ends from the sides of the recess, as shown inFig. 5. The pin 0 has to fit accurately the rounding bottom of therecess. It is of suitable material to present'a smooth surface andresist, without melting or disintegration, the heat of the molten metal,wroughtiron or steel having been found suitable for our purpose inmaking stove-castings.

D is a support or hood, made of sheet metal, with the ends bent andperforated to form the holes a, in which the pin may be supported, asshown in Fig. 3. This support is placed over the recess in the knuckle,so as to hold the pin 0, as shown in Fig.4. In this position it forms ahood over the recess a, inclosing it tightly upon all sides, so thatwhen the pattern is now molded in the sand in the usual manner not aparticle of sand can'find its way into said recess.

When the pattern is withdrawn from the drag, the pin 0 will be leftperfectly undisturbed and firmly supported in its proper position by thehood, which latter rests on the This holding of the hood in place ismold, as shown in Fig. 5. The mold being properly completed for castingand the molten metal poured into it inthe usual manner, it will flowaround the cylindrical pin and form a perfect cylindrical pin-hole inthe exact position required, and after the casting is removed from themold the pin can readily be driven out of the pin-hole.

' The essential requirements of the hood D are to support the pin 0 andhold it securely in its position in the mold, and to prevent the sand inmolding from filling into the cavity around the pin; but amongthedifferent forms The iron pin or chill is made to protrude I ing thepin therein the hood and the pin engaged'with each other may be preparedready I for use.

Our invention is not alone applicable to the casting of pin-holes inhinge-knuckles, but it will be found of great practical use for castingholes in stove catches, lugs, &c., where such holes may be used forother purposes; and

Figs. 7 and 8 are intended to illustrate such general use.

In Fig. 7, E is a catch of a stove-door, whic it is desirable to castwith ahole, f. This may be easily done by constructing a hood of tinsuch as the hood F, shown alongside of the aforementioned figure, whichis of corresponding shape and size with the catch, and supports the pinG. This hood, being used in connection with the pattern, of suitableform, in the manner above described, so as to permit of molding thecatch and withdrawing the pattern, leaving the hood in position in themold, will after casting form an integral part of the catch and the pincan be readily driven out.v

In Fig. 8, G represents a lug, which it is desired to east with a hole,h. For this purpose a suitable hood may be readily formed by striking upthe metal plate H of the form shown alongside. This plate can be easilybent into the required shape to form a hood and support the pin forcasting the hole.

The general application of our invention and the manner to proceed inother instances will now readily appear, and the desirability of havingthe hoods with the pin secured therein supplied by the trade for suchparts of the standard form and size as hinge-knuckles, stove-catches,850., will be conceded.

We are aware of the Patents Nos. 102,983 and 317,498, and niake'no claimto anything shown therein, as we consider our invention essentiallydifferent from the subjectmatter 5 of said patents.

secured in the hood and having projecting ends, substantially asdescribed.

3. The combination, with a pattern, B, having guiding-recess a, of aremovable. solid cy- 2o lindrical core, 0, and a core-carrier, D, having oppositely located circular openings 0, which areadapted to hold thecore 0 snugly in said carrier and through which the ends of said coreproject, substantially as and for the 2 5 purpose specified.

WILLIAM J. KEEP. JAMES J AMIESON.

Witnesses:

JOHN M. DWYER, J. FRED MOORE.

